In the early
1990's, I tried a small business with Esperanto. I made buttons
by hand with Esperanto words or phrases on them.

One of the
good ideas I had then was the design (drawn by my friend,) for
the T-shirt with "Onklo
Zam Bezonas Vin!" (available soley through the E-USA
bookstore.) That shirt is the best idea which I've though
up till now.